1 #pragma once 2 3 /* 4 * Copyright (C) 2017 The Android Open Source Project 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 #include <memory> 20 #include <mutex> 21 #include <thread> 22 #include <utility> 23 #include <vector> 24 25 #include "common/libs/threads/thread_annotations.h" 26 #include "host/frontend/vnc_server/blackboard.h" 27 #include "host/frontend/vnc_server/jpeg_compressor.h" 28 #include "host/frontend/vnc_server/simulated_hw_composer.h" 29 30 namespace cuttlefish { 31 namespace vnc { 32 class FrameBufferWatcher { 33 public: 34 explicit FrameBufferWatcher(BlackBoard* bb); 35 FrameBufferWatcher(const FrameBufferWatcher&) = delete; 36 FrameBufferWatcher& operator=(const FrameBufferWatcher&) = delete; 37 ~FrameBufferWatcher(); 38 39 StripePtrVec StripesNewerThan(ScreenOrientation orientation, 40 const SeqNumberVec& seq_num) const; 41 static int StripesPerFrame(); 42 43 private: 44 static Stripe Rotated(Stripe stripe); 45 46 bool closed() const; 47 bool StripeIsDifferentFromPrevious(const Stripe& stripe) const 48 REQUIRES(stripes_lock_); 49 // returns true if stripe is still considered new and seq number was updated 50 bool UpdateMostRecentSeqNumIfStripeIsNew(const Stripe& stripe) 51 REQUIRES(stripes_lock_); 52 // returns true if stripe is still considered new and was updated 53 bool UpdateStripeIfStripeIsNew(const std::shared_ptr<const Stripe>& stripe) 54 EXCLUDES(stripes_lock_); 55 // Compresses stripe->raw_data to stripe->jpeg_data 56 void CompressStripe(JpegCompressor* jpeg_compressor, Stripe* stripe); 57 void Worker(); 58 void Updater(); 59 60 StripePtrVec& Stripes(ScreenOrientation orientation) REQUIRES(stripes_lock_); 61 const StripePtrVec& Stripes(ScreenOrientation orientation) const 62 REQUIRES(stripes_lock_); 63 64 std::vector<std::thread> workers_; 65 mutable std::mutex stripes_lock_; 66 std::array<StripePtrVec, kNumOrientations> stripes_ GUARDED_BY(stripes_lock_); 67 SeqNumberVec most_recent_identical_stripe_seq_nums_ 68 GUARDED_BY(stripes_lock_) = MakeSeqNumberVec(); 69 mutable std::mutex m_; GUARDED_BY(m_)70 bool closed_ GUARDED_BY(m_){}; 71 BlackBoard* bb_{}; 72 SimulatedHWComposer hwcomposer{bb_}; 73 }; 74 75 } // namespace vnc 76 } // namespace cuttlefish 77